Conductive Rubber Sensor Interconnect for Insulin Pump Occlusion Detection

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Solution Overview

Problem

Existing insulin pumps face challenges in detecting occlusions, which can limit or prevent insulin delivery, requiring precise and reliable occlusion sensors while maintaining a compact and portable design.

Innovation Solution

A method and device for connecting a force sensor to a flexible circuit board using conductive rubber elements to establish electrical connections between contact tabs and conductive leads, allowing for precise and reliable occlusion detection without the need for soldering or adhesives, and accommodating varying heights between contact pads and leads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If soldering or adhesives are used to connect the force sensor to the circuit board, then electrical connection reliability is improved, but the manufacturing process becomes more costly and complex

Engineering Contradiction:
Improveelectrical connection reliabilityVSAvoidmanufacturing process complexity
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent introduces conductive rubber elements as intermediary components between the force sensor contact tabs and the circuit board conductive leads. These rubber elements serve as flexible electrical connectors that eliminate the need for soldering or adhesives, thereby reducing manufacturing complexity while maintaining reliable electrical connections. The conductive rubber acts as a mediator that bridges the mechanical and electrical interfaces without requiring complex thermal or chemical bonding processes.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Volume of moving object

If the pump size is reduced for portability, then user comfort is improved, but the space for sensor integration and wiring becomes more limited

Engineering Contradiction:
Improvepump sizeVSAvoidsensor integration complexity
Core Design Contradiction:
Volume of moving objectVSDevice complexity

Solution Approach 1:

The patent employs flexible circuit boards with conductive leads and conductive rubber elements that can be bent and shaped to fit within compact pump housings. The flexible nature of these components allows them to adapt to limited space while maintaining electrical connectivity. This flexibility enables sensor integration in small form factors without requiring complex rigid wiring harnesses or large assembly spaces.

Inventive Principle:
Principle #30Flexible shells and thin films

3Strength

If soldering is used to establish electrical connections, then connection strength is improved, but the risk of heat damage to sensitive components increases

Engineering Contradiction:
Improveconnection strengthVSAvoidheat damage risk
Core Design Contradiction:
StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the thermal bonding process of soldering with a mechanical compression system using conductive rubber elements. The electrical connections are established through mechanical pressure that forces conductive pathways through the rubber material, eliminating exposure to high temperatures. This mechanical substitution maintains connection strength through compression force while avoiding the harmful thermal effects that could damage sensitive sensor components or surrounding electronics.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables reliable and precise detection of occlusions in insulin pumps, ensuring consistent insulin delivery while maintaining a small and compact pump design, avoiding costly manufacturing processes and potential damage from heat-based soldering.

Implementation Method 1

arranging a first conductive rubber element such that an electrical connection between the contact pad of the first contact tab and the first conductive lead is established

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11406759B2Method and devices for pressure determination in an insulin pump
Publication Date: 2022.08.09 ROCHE DIABETES CARE INC
  • US11406759B2 patent drawing
  • US11406759B2 patent drawing
  • US11406759B2 patent drawing

AI summary

A method for connecting a force sensor to a circuit board is disclosed. A circuit board having first and second conductive leads located on the same surface of the circuit board is provided. Also provided is a force sensor with a first flexible contact tab having a first contact pad and a second flexible contact tab having a second contact pad. The first contact pad is arranged to face the first conductive lead. A first conductive rubber element establishes an electrical connection between the first contact pad and the first conductive lead, and the second contact pad and the second conductive lead are arranged to face in the same direction. A second conductive rubber element establishes an electrical connection between the second contact pad and the second conductive lead. Also disclosed are an associated device for determining fluid pressure in an insulin pump and an insulin pump.